Email Attachment Compressor
Reduce PDF & image sizes under 25MB limits to avoid mail client delivery issues instantly.
Tap to choose filesDrag & drop multiple files
or browse files
Supports: PDF · up to 50 MB
Max 20 files, 50MB each
Email Attachment Compressor - Shrink Files to Send Easily
How to Compress Email Attachments
- Upload files: Select one or more PDFs, JPEGs, WebPs, or PNGs.
- Specify targets: Choose your target size to fit standard email boundaries (usually 25MB).
- Download: Optimize files locally and download them for quick attachment.
Why Use Our Attachment Compressor?
- Bypass SMTP Limits: Gmail, Outlook, and Yahoo restrict files to 25MB. Keep yours under the limit.
- Batch Processing: Upload and compress multiple attachments simultaneously.
- Maintain Formatting: Document vector paths and text layouts remain completely unchanged.
Attachment Limits by Email Service
| Service | Attachment limit | Aim for |
|---|---|---|
| Gmail | 25 MB per email | Under 18 MB in total |
| Outlook.com / Hotmail | 20 MB per email | Under 14 MB in total |
| Yahoo Mail | 25 MB per email | Under 18 MB in total |
| Office / college mail (Microsoft 365, Google Workspace) | Set by the IT team, often 10–35 MB | Under 7 MB to be safe |
Why aim lower than the limit? Email encodes attachments as text before sending, which makes them about a third larger. A 20 MB PDF becomes roughly 27 MB in transit and bounces off a 25 MB limit. The receiver's server can also be stricter than yours.
Which Size to Pick
- Job applications and HR: keep each file under 2 MB. See the resume compressor or compress PDF to 2MB.
- College, school or government offices: under 5 MB per email; use compress PDF to 5MB. Scanned certificates go further with the marksheet compressor.
- Sending ID proof by email: compress the Aadhaar PDF to 500 KB; it stays readable and won't clog the recipient's inbox.
- Many photos at once: compress each photo to 300–500 KB; twenty phone photos then fit in a single email.
Common Scenarios for Attachment Optimization
Sending resumes, scanned portfolios, digital booklets, and monthly reports often fails due to heavy graphic assets. Compressing your attachments ensures they are delivered directly to the inbox instead of getting uploaded as temporary cloud drive links that expire or require permissions.
Safe and Secure File Reduction
We process your corporate records, personal CVs, and designs client-side in the browser. The files are not uploaded to remote cloud networks, preventing corporate compliance violations and data snooping.
Attaching a specific document type? Try compress PDF to 1MB or compress PDF to 2MB for a precise target.
Frequently Asked Questions
What is Gmail's maximum attachment size?
Gmail limits attachments to 25MB. If you attach multiple files, their combined size must be under 25MB.
What is Outlook's attachment size limit?
Outlook.com and Hotmail accept up to 20MB of attachments per email. Company Outlook accounts on Microsoft 365 use a limit set by the IT team. Because attachments grow by about a third when sent, aim for 14MB or less on Outlook.com.
Will compressing my attachments change their layouts?
No. The formatting, layout, and text searchability of your PDFs will remain completely intact.
How do I attach multiple large files?
Simply run each file through our local compressor. You can shrink them by up to 90%, fitting more documents inside a single message.
Can I compress PDFs and images together?
Yes, you can upload PDFs and image types sequentially and optimize them individually to match their respective targets.
Does this tool support files other than PDFs and images?
Currently, our tool is optimized for heavy files like PDFs, JPEGs, PNGs, and WebPs, which represent the bulk of email attachment payloads.